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From:   Guo Ren <guoren@kernel.org>
Date:   Mon, 7 Jun 2021 00:54:05 +0800
Message-ID: <CAJF2gTQ1yvSNthJ2yJkqaYGaJ6OYmf0vbG=hm4ocgnw4DiZbOw@mail.gmail.com>
Subject: Re: [RFC PATCH v2 00/11] riscv: Add DMA_COHERENT support for
 Allwinner D1
To:     =?UTF-8?Q?Jernej_=C5=A0krabec?= <jernej.skrabec@gmail.com>
Cc:     Anup Patel <anup.patel@wdc.com>,
        Palmer Dabbelt <palmerdabbelt@google.com>,
        Arnd Bergmann <arnd@arndb.de>, wens@csie.org,
        maxime@cerno.tech, Drew Fustini <drew@beagleboard.org>,
        liush@allwinnertech.com,
        =?UTF-8?B?V2VpIFd1ICjlkLTkvJ8p?= <lazyparser@gmail.com>,
        wefu@redhat.com, linux-riscv <linux-riscv@lists.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        linux-arch <linux-arch@vger.kernel.org>,
        linux-sunxi@lists.linux.dev, Guo Ren <guoren@linux.alibaba.com>
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V5 is not related to the patch series.

On Mon, Jun 7, 2021 at 12:29 AM Jernej =C5=A0krabec <jernej.skrabec@gmail.c=
om> wrote:
>
> Hi!
>
> Dne nedelja, 06. junij 2021 ob 11:03:55 CEST je guoren@kernel.org napisal=
(a):
> > From: Guo Ren <guoren@linux.alibaba.com>
> >
> > The RISC-V ISA doesn't yet specify how to query or modify PMAs, so let
> > vendors define the custom properties of memory regions in PTE.
> >
> > This patchset helps SOC vendors to support their own custom interconnec=
t
> > coherent solution with PTE attributes.
> >
> > For example, allwinner D1[1] uses T-HEAD C906 as main processor, C906 h=
as
> > two modes in MMU:
> >  - Compatible mode, the same as the definitions in spec.
> >  - Enhanced mode, add custom DMA_COHERENT attribute bits in PTE which
> >    not mentioned in spec.
> >
> > Allwinner D1 needs the enhanced mode to support the DMA type device wit=
h
> > non-coherent interconnect in its SOC. C906 uses BITS(63 - 59) as custom
> > attribute bits in PTE.
> >
> > The patchset contain 4 parts (asid, pgtable, cmo, soc) which have been
> > tested on D1:
> >  - asid: T-HEAD C906 of D1 contains full asid hw facilities which has n=
o
> >    conflict with RISC-V spec, and hope these patches soon could be
> >    approved.
> >  - pgtable: Using a image-hdr to pass vendor specific information and
> >    setup custom PTE attributes in a global struct variable during boot
> >    stage. Also it needs define custom protection_map in linux/mm.
> >  - cmo: We need deal with dma_sync & icache_sync & __vdso_icache_sync.
> >    In this patchset, I just show you how T-HEAD C9xx work, and seems At=
ish
> >    is working for the DMA infrustructure, please let me know the idea.
> >  - soc: Add allwinner gmac driver & dts & Kconfig for sunxi test.
> >
> > The patchset could work with linux-5.13-rc4, here is the steps for D1:
> >  - Download linux-5.13-rc4 and apply the patchset
> >  - make ARCH=3Driscv CROSS_COMPILE=3Driscv64-linux- defconfig
> >  - make ARCH=3Driscv CROSS_COMPILE=3Driscv64-linux- Image modules dtbs
> >  - mkimage -A riscv -O linux -T kernel -C none -a 0x00200000 -e 0x00200=
000
> > -n Linux -d arch/riscv/boot/Image uImage - Download newest opensbi [2],
> > build with [3], and get fw_dynamic.bin - Copy uImage, fw_dynamic.bin,
> > allwinner-d1-nezha-kit.dtb into boot partition of TF card.
> >  - Plugin the TF card and power on D1.
> >
> > Link: https://linux-sunxi.org/D1 [1]
> > Link: https://github.com/riscv/opensbi branch:master [2]
> > Link:
> > https://github.com/riscv/opensbi/blob/master/docs/platform/thead-c9xx.m=
d
> > [3]
> >
>
> Some patches are marked with v2 and some V5. It's very confusing. Mark th=
em
> with same version in next revision.
>
> Best regards,
> Jernej
>
> > Changes since v1:
> >  - Rebase on linux-5.13-rc4
> >  - Support defconfig for different PTE attributes
> >  - Support C906 icache_sync
> >  - Add Allwinner D1 dts & Kconfig & gmac for testing
> >  - Add asid optimization for D1 usage
> >
> > Guo Ren (10):
> >   riscv: asid: Use global mappings for kernel pages
> >   riscv: asid: Add ASID-based tlbflushing methods
> >   riscv: asid: Optimize tlbflush coding convention
> >   riscv: pgtable: Fixup _PAGE_CHG_MASK usage
> >   riscv: pgtable: Add custom protection_map init
> >   riscv: pgtable: Add DMA_COHERENT with custom PTE attributes
> >   riscv: cmo: Add dma-noncoherency support
> >   riscv: cmo: Add vendor custom icache sync
> >   riscv: soc: Initial DTS for Allwinner D1 NeZha board
> >   riscv: soc: Add Allwinner SoC kconfig option
> >
> > liush (1):
> >   riscv: soc: Allwinner D1 GMAC driver only for temp use
> >
> >  arch/riscv/Kconfig                                 |    9 +
> >  arch/riscv/Kconfig.socs                            |   12 +
> >  arch/riscv/boot/dts/Makefile                       |    1 +
> >  arch/riscv/boot/dts/allwinner/Makefile             |    2 +
> >  .../boot/dts/allwinner/allwinner-d1-nezha-kit.dts  |   29 +
> >  arch/riscv/boot/dts/allwinner/allwinner-d1.dtsi    |  100 +
> >  arch/riscv/configs/defconfig                       |    1 +
> >  arch/riscv/include/asm/cacheflush.h                |   48 +-
> >  arch/riscv/include/asm/mmu_context.h               |    2 +
> >  arch/riscv/include/asm/pgtable-64.h                |    8 +-
> >  arch/riscv/include/asm/pgtable-bits.h              |   20 +-
> >  arch/riscv/include/asm/pgtable.h                   |   44 +-
> >  arch/riscv/include/asm/sbi.h                       |   15 +
> >  arch/riscv/include/asm/soc.h                       |    1 +
> >  arch/riscv/include/asm/tlbflush.h                  |   22 +
> >  arch/riscv/include/asm/vendorid_list.h             |    1 +
> >  arch/riscv/kernel/sbi.c                            |   19 +
> >  arch/riscv/kernel/soc.c                            |   22 +
> >  arch/riscv/kernel/vdso/flush_icache.S              |   33 +-
> >  arch/riscv/mm/Makefile                             |    1 +
> >  arch/riscv/mm/cacheflush.c                         |    3 +-
> >  arch/riscv/mm/context.c                            |    2 +-
> >  arch/riscv/mm/dma-mapping.c                        |   53 +
> >  arch/riscv/mm/init.c                               |   26 +
> >  arch/riscv/mm/tlbflush.c                           |   57 +-
> >  drivers/net/ethernet/Kconfig                       |    1 +
> >  drivers/net/ethernet/Makefile                      |    1 +
> >  drivers/net/ethernet/allwinnertmp/Kconfig          |   17 +
> >  drivers/net/ethernet/allwinnertmp/Makefile         |    7 +
> >  drivers/net/ethernet/allwinnertmp/sunxi-gmac-ops.c |  690 ++++++
> >  drivers/net/ethernet/allwinnertmp/sunxi-gmac.c     | 2240
> > ++++++++++++++++++++ drivers/net/ethernet/allwinnertmp/sunxi-gmac.h    =
 |
> > 258 +++
> >  drivers/net/phy/realtek.c                          |    2 +-
> >  mm/mmap.c                                          |    4 +
> >  34 files changed, 3714 insertions(+), 37 deletions(-)
> >  create mode 100644 arch/riscv/boot/dts/allwinner/Makefile
> >  create mode 100644 arch/riscv/boot/dts/allwinner/allwinner-d1-nezha-ki=
t.dts
> > create mode 100644 arch/riscv/boot/dts/allwinner/allwinner-d1.dtsi crea=
te
> > mode 100644 arch/riscv/mm/dma-mapping.c
> >  create mode 100644 drivers/net/ethernet/allwinnertmp/Kconfig
> >  create mode 100644 drivers/net/ethernet/allwinnertmp/Makefile
> >  create mode 100644 drivers/net/ethernet/allwinnertmp/sunxi-gmac-ops.c
> >  create mode 100644 drivers/net/ethernet/allwinnertmp/sunxi-gmac.c
> >  create mode 100644 drivers/net/ethernet/allwinnertmp/sunxi-gmac.h
>
>
>
>


--=20
Best Regards
 Guo Ren

ML: https://lore.kernel.org/linux-csky/